Method of making paper and similar material pliable.



' FERDINAND EVERS, 0F DUSSELDORF, GERMANY.

METHOD OF MAKING PAPER AND SIMILAR MATERIAL PLIABLE.

957,196. No Drawing;

Specification of Letters Patent. Application filed September 8, 1909: Serial No. 516,775.

Patented May 10, 19140.

To all whom it may concern:

Be it known that I, FERDINAND'EVERS, analytical chemist, a citizen of the German Empire, residing at Stephanienstrasse No. 42, Dusseldorf, in the Province of Rhineland, Prussia, have invented new and useful Improvements in Methods of Making Paper and Similar Material Pliable, of which the following is a specification.

This invention relates to an improved method of making paper and similar materials pliable, such as paste board, textile materials, tobacco, cork sheets and thin wooden plates.

For the urpose of smoothing papers, textile materlals, ve etable matter and other similar materials or a pretty long time past already, glycerin, technical grape sugar and glucose obtained from starch have been employed. Glycerin is unquestionably suitable or that very purpose; it is, however, very expensive Besides its manufacture, which frequently takes place from rancid or rotten waste-fats, does not qualify it as an article fit for being used in the industries of foodstufls and table-luxuries.

Grape sugar or glucose obtained from starch is no suitable means for making paper and other similar materi'alspliable. When the weather is muggy, the paper prepared by grape-sugar or glucose respectively, at tains a certain suppleness indeed; if, however, the 'weather is dry, or when the paper is stored up in a dry place, it becomes just as hard and rough as if it had not been prepared at all. This drawback is more particularly noticeable in the case of parchment paper which, as is well known, is frequently prepared with grape-sugar.

According to the present method, inverted sugar or fru1tsugar respectively is to be used for making paper pliable. The more complete the inversion of the sugar is,that is to say, the smaller is its percentage of unconverted sucrose, the more suitable is it for making paper pliable. The ingredient of the inverted sugar, which possesses the properties necessary for producing suppleness, is

the fruit sugar termed levulose, which is ex-,

ceedingly hygroscopic and, therefore, possesses those qualities on which the suppling operation is principally based. A highly 1nverted inverted sugar has only recently become known and likewise pure levulose or' fruit-sugar. The danger now exists with concentrated solutions of inverted sugar, which do not contain sucrose or only a slight portion of it, that dextrose is crystallized out. This, however, can be prevented by the addition of moderate quantities of salts. Those which are best lit for this purpose are the soluble chlorids, sulfates andacetates of ammonium, of the alkalies and alkaline earths, but also slight quantities of glucose obtained from starch and glycerin can be used for avoiding crystallization.

By way of example one form of o eration according to the new method is escribed hereunder :75 kgs. of inverted sugar are dissolved in 25 kgs. of a hydrated solution of 2.5 kgs. of chlorid ofsodium or chlorid of calcium respectively in 22.5 kgs. of water. Or 90 kgs. of levulose (fruit sugar) are admixed to 10 kgs. of glycerin or 95 k of levulose (fruit sugar) to 5 kgs. of g ucose obtained from starch. According to the degree of suppleness to be obtained, 10, 25, 50 or 75 kgs. of this solution are taken for 100 kgs. of impregnating liquid, by simply intermixing these quantities with a corresponding quantity of water. Hereupon the objects to be supplied, thus e, g. the pasteboard, or parchment paper, tobacco-leaves, textile material, thin cork or wood-tables, yarns and other similar materials are saturated with this impregnating liquid, and then these stuifs are allowed to dry in the open air or by means of hot cylinders or calenders respectively. In this way these stuffs are made pliable and prevented from getting moldy with the very same certainty as if they were glycerized.

I claim Method of making paper and similar materials pliable which consists in mixing a hydrated solution of inverted sugar with an ammonium salt, and saturating said material with the mixture thus obtained.

Signed by me at Barmen, Germany, this 28th day of August 1909.

FERDINAND EVERS. [L. s.]

Witnesses:

O'rro KoNIG, WILLY KLEIN. 

